Dynamo-electric machine.



PATENTEDJUNE 2: 2 was R. B. WILLIAMSON,

DYNAMO ELECTRIC MACHINE. APPLICATION FILED JULY 30. 1903.

INVENTOR W I Raberl RWilliumsam BY ATTORNEY WITNESSES tic "ti/nihi ism QQPK UNITED sTATns Tr 'rEN orrion nosiun'r' s.':wrL 1AMsoN',-or onwoon, euro, ASSIGNOR TO ALLIS-OHALMERS COMPANY,

" IATCORPORKTI OE OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFAOTURlNG COM- IPANYL A conclusion or onto.

DYNAMO-ELESTBIG mecnmn.

as; senate;

specificaticnxoi Letters Patent.

Patented. June as, 1908.

I Application .illed July so, recs. Berial N 3283M.

dynamo-electric machines and particularly for heavy current or' high speedmachines.

' In machines designed for large current out "put it is' necessary to -provide long commutators to obtaintheproper current carrying capacity. In such machines special means must be provided for holding the segments so that they may not buckle or bendlon account of heatexpansion. Also in highspeed -machines such as turbo-generators means must be provided for preventing distortion of the segments due to centrifugal force. To overcome thesedifiiculties it has been proposed to supportthe segments at the ends vand also intermediate-the ends, the supports intermediate the ends being arranged either at the-inner surface of the segments or around i the outer surface thereof. The constructions heretofore employed havenot been-satisfac- {tor for all purposes chiefly on accsunt of the cost, the difficulty of assembling and adju'stingsegments and the increased radial dimensions of the segments and o the commutator. The supports around the outer surface of the-segments, which r .i'pports are usually shrink-rings are furthr objectionable for the reason that they co: er-active surfaces of the commutator and -';'or the reason.

that on account of the proxrpiity of the rings .ito the brushes, there is danger of flashing.

The objeht of my' invention is to provide for machines of large current output or high speeds, a commutator construction, the segments' of whieh-are supported intermediate their ends, which is inexpensive and-s0 de- {5- signed that the segments; can be easily assembled, adjusted or removed without necessitating I an increase in .thesegments. I

'My invention consists in the details of conthe proportions of struction and in the combinations and arrangements of parts described in the speciiie cation and set forth in the appendedclaims.

For a better understanding of my invention, reference is had to the accompanying drawings which Figure 1 is an elevation of a machine havmg a long commutator constructed in accordance with my invention; Fig. 2 is a detail of'a commutator segment and the supports" therefor; Fig. 3 is a partial transverse section taken through the commutator substahtially midway between the ends thereof, the parts being shown on a slightly enlarged scale; and Fig. 4 is a view of a slightly modified intermediate support.

Referring now to the figures ofthe drawing I have shown at 10 a dynamo-electric machine having a commutator 11 provided with long segments 12, the end and interme diate supports for which are shown in Figs. 2, 3 and 4.

At '13 are shownthe brush studs which carry the brush holders, (not shown).

Referring first to Fig. 21 have shown at 14 a commutator hub or spider on whichthe segments are mounted, suitable insulation being interposed between the segments and spider." The segments are provided at their ends with V-shaped slots 15 io receivethe .usual wedge or i -shaped holding or clamping rings 16, which rest on'the spider and are iadjustably"secured thereto by screws 17.

Midway between the ends of each segment is an undercut, dove-tail or double V-shaped slot 18 adapted to receive two separate and relatively movable V or wedge-shaped holding ringsjl.) and 20. As shown in this figure both rings are separate from the hub or s ider and are adapted to be moved axially a ong the shaft in one direction to secure the segments in position, and in the opposite direction to permit the segments to be removed. Various means may be provided for tightening and holding in position the rings 19 andZO. In this instance I employ for this purpose two sets of radial tightening screws 21 and 22 the heads of which extend inward beyond the shell of the hub of spider,

first described construction and a movable 1. 7

The intermediate rings 19 and 20 are then spread apart'by means and "the outer ends of which. are inclined or eveled and are adapted to engage inclined faces 23 and 24 of the'rings 19 and 20 respectively. The spider is provided between the tightening screws with longitudindl slots 25, the pur use of which will be explained,

in assem ling the segments, the screws 21, and 22 are moved inward until the outer ends are flush with or below the surface of the hub and the rings are then moved'toward each other until the distance'across the tops of the rings is less than the narrowest parts of the do'veetail slots 18 of the segments. The segments are then placed on the spider-and secured thereto by tighteningthe end-rings 16.

of any tool or instrument inserted in the slots 25. The rings areneXt forced tightly into' the V-shaped portions of the slots by means of the radial tightening screws 21 and 22. By means of the check nuts 26, the screws and rings are held securely in position. 1

In Fig. 4 I haveshown a slight modification of my invention, the hub, 2'7 is provided with an'integral V-shaped flange 28 similar. in shape to one of tightening rings in the V-shaped tightening ring 29. The seg ments are assembled by moving the ring 29 toward the flange 28 until the distance from the tip of the flange to the tip of the ring is less than the narrowest part of the dove-tail slot. In this case the segments must be moved longitudinally until the ll-shaped flange engages the corresponding V-shaped slot in the segment. The ring 29 is then moved firmly into positionas in the first construction. Y

The constructions shown are effective, simple, and inexpensive, and the segments can be assembled and tightened without difficulty. Since the segments are provided with dove-tail slots to receive the intermediate supports, less copper is re quired than in the construction in which the segments are provided with dove-tail projections extending inward beyond the body of the segments, and also the commutator can be made of less diameter. It also avoids the use of shrunk-011 steel rings on-the active surface of the commutator.

I do not wish to be confined to details shown but aim in' my claims to cover all modifications which do not involve a departure from the spirit and scope of my invention. I

What I claim as new and desire to secure l by Letters Patent is 1. In a dynamo-electric machine, a'commutator support, commutator segments resting thereon substantially throughout mlitator support, mounted thereon, said so dercut dove tail slots ends, clamping means at the ends of merits, clamping rin sv in said undercut slots, and means for spread them in position independently of the ,end {clam ing means. Y

commutator se clamping means segments, and meanstor shifting said clamping means. from 4. spider, commutator segments mounted thereon, said segments having undercut slots in termediate their ends, a clamping ring in said slots tending to force each point intermediate its ends toward said hub or spider, and means for shifting said ring comprising adjusting devices extending through the wall of the hub or spider.

their length, said segments having undercut slots intermediate their ends, means at the ends of the segments, a con tinuous clam means for shi pendently of ing member in said slots, and ting said member axially indethe end clamping means.

2. In a dynamo-electric machine, a com commutator segments gm'ents having un intermediate thei] the seging said rings to tighten 3; n a commutator, a hell w support,

gments mounted thereon, .mtermediate the ends of the the interior of the support. In a commutator, a hollow'' hu or segment at a '5. Ina commutator for dynamo-electric machines, a hub or spider, segments mounted on said hub, means for supporting the segments at their undercut 'slots clamping adapted to lit into said' means engaging said ring for forcing the latter axially into the slots.

ends, said segments having intermediate their ends, a ring. surroundin the hub and slots, and radial 6. In a commutator for dynamo-electric machines, a hub 01' spider, segments mounted on the hub, means for ments at their ends, ing the segments intermediate their ends comprising a pair of termediate supporting means being indep means for moving sai from each other.

supporting the segmeans for supportmovable rings, said inendent of the end su porting means, and rings axially away 7. In a commutator for dynamo-electric machines, a hub or spider, segments mounted on the hub or spider andsupported at their ends, means independent of the end supthe exact porting means for supporting the segments I intermediate their ends comprising two axially movable rings,- said rings. being located in undercut and means for moving away from each other.

slots in the segments, said rings axially In a commutator for dynamo-electric machines, a hub or spider, segments mounted thereon, means for supporting thesegments mtermed1ate their ends comprising an axially clamping movable ol'amping'vrin and a plurality of radial bolts orfscrews or moving said ring. I 9. In. a commutator for dynamo-electricmachines, .ayhub or spider, segments mounted 5 thereon, means or supportingthe' segments t their ends and termediatmtheir"endsg ggidintermediate'clampin means; oomprisf g two relativelymova'b e clamping rings,

/ land radial screws 01' bolts mounted in the hub for. adjusting the rings. I y 10 In testimony whereof I afiix mysign ature, in the presence of two witnesses; I

v v j} ROBERT B. WILLIAMSON. 1 I Witnesses: ARTHUR F. Kwls,"

.FRED J. KmsEY. 

